I would not put too much weight on response speed during the sales pitch. A well-organised agency can answer prospects quickly while the eventual file handler is overloaded, and the reverse can also happen.
For comparable sales, ask them to explain why the examples resemble this villa in...
Use medians as well as averages. A few unusually priced properties can distort an average in a small sample, while the median will at least show whether the middle of the group tells the same story.
One more definition to settle: does “asking price” mean the original ask or the final advertised ask before removal? The difference between original ask and completion measures the whole marketing process; final ask versus completion is closer to last-stage negotiation.
Will this be your main home, a second home or rented out, and are you buying personally or considering another structure? Without those facts, even a careful estimate may answer the wrong question. I’d also ask who is checking historic property charges and whether any amount can remain attached...
For the next pass, record first listing date, each asking-price change, condition, property type, smaller area, withdrawal date and completion date where available. Keep unknowns blank rather than inferring them. That should expose relistings and timing mismatches.
Listing history matters too. If a property is withdrawn and relisted, its apparent time on market may restart. Duplicate advertisements can also make inventory look larger unless individual homes are identified consistently.
The floor area is the first thing I would pin down, especially because it says “approximately.” Does the 165 m² refer entirely to living space, or does it include areas counted differently? A floor plan with room measurements would make the asking price easier to assess.